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# -*- coding: utf-8 -*-
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""" Imports and provides the 'correct' version of readline for the platform.
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Readline is used throughout IPython as::
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import IPython.utils.rlineimpl as readline
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In addition to normal readline stuff, this module provides have_readline
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boolean and _outputfile variable used in IPython.utils.
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"""
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import sys
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try:
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from readline import *
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import readline as _rl
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have_readline = True
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except ImportError:
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try:
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from pyreadline import *
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import pyreadline as _rl
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have_readline = True
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except ImportError:
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have_readline = False
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if sys.platform == 'win32' and have_readline:
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try:
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_outputfile=_rl.GetOutputFile()
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except AttributeError:
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print "Failed GetOutputFile"
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have_readline = False
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# Test to see if libedit is being used instead of GNU readline.
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# Thanks to Boyd Waters for this patch.
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uses_libedit = False
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if sys.platform == 'darwin' and have_readline:
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import commands
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# Boyd's patch had a 'while True' here, I'm always a little worried about
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# infinite loops with such code, so for now I'm taking a more conservative
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# approach. See https://bugs.launchpad.net/ipython/+bug/411599.
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for i in range(10):
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try:
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(status, result) = commands.getstatusoutput( "otool -L %s | grep libedit" % _rl.__file__ )
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break
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except IOError, (errno, strerror):
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if errno == 4:
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continue
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else:
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break
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if status == 0 and len(result) > 0:
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# we are bound to libedit - new in Leopard
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_rl.parse_and_bind("bind ^I rl_complete")
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print "Leopard libedit detected."
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uses_libedit = True
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# the clear_history() function was only introduced in Python 2.4 and is
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# actually optional in the readline API, so we must explicitly check for its
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# existence. Some known platforms actually don't have it. This thread:
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# http://mail.python.org/pipermail/python-dev/2003-August/037845.html
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# has the original discussion.
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if have_readline:
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try:
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_rl.clear_history
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except AttributeError:
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def clear_history(): pass
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_rl.clear_history = clear_history
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